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针对垂直激振下土壤的恢复力与变形之间的不对称滞回特性,采用多线段不对称滞回模型,建立含该模型的2自由度压实系统动力学模型,通过谐波线性化计算滞回力的等效刚度及等效阻尼。通过数值仿真的方法 ,研究压实进程中激振频率、激振力幅和土壤参数对振动轮动响应的影响特性。仿真结果表明:压实终期采取低振幅高频激振,可避免振动轮产生跳振现象,使压实土壤受到冲击破坏,从而保证压实质量和提高压实效率。
Aiming at the asymmetric hysteretic behavior between the restoring force and deformation of soil under vertical excitations, a multi-line asymmetric hysteretic model was adopted to establish a dynamic model of 2-DOF compaction system with this model. By harmonic linearization Equivalent Stiffness and Equivalent Damping of Hysteresis. Through the numerical simulation, the influence of vibration frequency, amplitude of exciter force and soil parameters on vibration and wheel vibration response during compaction process was studied. The simulation results show that the low-amplitude and high-frequency excitation at the final stage of compaction can avoid the vibration of the vibration wheel and make the compacted soil damaged by impact, so as to ensure the compaction quality and improve the compaction efficiency.